Black Rain Ordnance BROSPEC15300BLK: The Black Rain Ordnance Spec series is a line of AR15 rifles and pistols built to meet bid requirements for law enforcement and military personnel and as an affordable option for civilian use.The SPEC15 Carbine uses a direct impingement gas system, has a non-adjustable gas block, and a salt bath BCG. It has a billet 7075 T6 aluminum upper and lower receiver, 4150 chormoly barrel and a 12" M-Lok hybrid handguard. This model has 16" barrel with a black nitride finish, A2 flash hider, Enhanced G.I. Sopmod buttstock, and a black hardcoat anodized receiver finish.